nutrition and digestion in human

Question: What are the various modes of nutrition? Answer: The two main methods of nutrition are autotrophic and heterotrophic. These are further divided into different types as follows: Autotrophic nutrition In this type, the organisms synthesize their own..

, (+) - thyroxine, has none of this effect but is used to lower the cholesterol levels. In foods, the chirality of compounds determines the nutritional value, sensory properties or biological activity. Enantiomers of a chemical may have very different flavors. Detection of an unnatural ra..

They are said to be partly autotrophic and partly heterotrophic. These autotrophs supplement their nutritional requirements by trapping and digesting insects and other small animals. The trapped insects are killed and their proteins are digested by proteolytic enzymes..

. Natural resource and human society are inseparable. Examples: Water and air Most artificial resources created by man draw support directly and indirectly from one or more natural resources. With this, human society is developing with man - made resources on one hand and natura..

Digestion takes place in specialised cavities joined together to form a continuous canal. It is called the alimentary canal. The alimentary canal is divided into three main portion..

The lymph vessels that remain in the center of the villi of alimentary canal are called lacteals. They collect milk white fluid called chyle from the intestine after digestion. The lacteals absorb fats from the intestine. Main drainage routes of Lymphatic Sys..

There are some other interesting forms of nutrition like the coprophagy which refers to feeding on faeces and carrion feeders which feed on decomposing animal bodies. There are certain plants which grow in nitrogen-deficient conditions and they meet this requirement by feeding on insects..

The removal of undigested food or waste matter from the body is called egestion. In lower unicellular organisms like the Amoeba, egestion is through the general body surface or the cell surface. In multicellular organisms like the Hydra, ingestion and egestion have a common opening. However, in hi..

Question: Why should we conserve forests and wildlife? Answer: Forests and wildlife play a vital role in the life and culture of the people. They form an important renewable natural resource and act as a source of gene pool for flora and fauna used in breeding programs in agriculture and..

Zooflagellates are unicellular organisms which may be free living or parasitic. Many of them occur as parasites in various hosts. Some of them occur as symbionts. They have an elongated body containing a single, large nucleus. The body is surrounded by a transparent pellicle. One or two flagella ar..